OM13013,598 NXP Semiconductors, OM13013,598 Datasheet - Page 363
OM13013,598
Manufacturer Part Number
OM13013,598
Description
BOARD DEMO IAR LPC1227 JLINKLITE
Manufacturer
NXP Semiconductors
Series
-r
Specifications of OM13013,598
Design Resources
LPC122x-SK Brd Schematic
Processor To Be Evaluated
LPC1227
Processor Series
LPC122x
Data Bus Width
32 bit
Interface Type
UART, SSP, SPI, I2C
Cpu Core
ARM Cortex-M0
Maximum Operating Temperature
+ 85 C
Minimum Operating Temperature
- 40 C
Operating Supply Voltage
3 V to 3.6 V
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Other names
568-6885
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25.3.1.4 Exceptions and interrupts
25.3.1.5 Data types
25.3.1.6 The Cortex Microcontroller Software Interface Standard
Table 359. CONTROL register bit assignments
Handler mode always uses the MSP, so the processor ignores explicit writes to the active
stack pointer bit of the CONTROL register when in Handler mode. The exception entry
and return mechanisms update the CONTROL register.
In an OS environment, it is recommended that threads running in Thread mode use the
process stack and the kernel and exception handlers use the main stack.
By default, Thread mode uses the MSP. To switch the stack pointer used in Thread mode
to the PSP, use the MSR instruction to set the Active stack pointer bit to 1, see
Section
Remark: When changing the stack pointer, software must use an ISB instruction
immediately after the MSR instruction. This ensures that instructions after the ISB execute
using the new stack pointer. See
The Cortex-M0 processor supports interrupts and system exceptions. The processor and
the Nested Vectored Interrupt Controller (NVIC) prioritize and handle all exceptions. An
interrupt or exception changes the normal flow of software control. The processor uses
handler mode to handle all exceptions except for reset. See
Section 25–25.3.3.6.2
The NVIC registers control interrupt handling. See
information.
The processor:
ARM provides the Cortex Microcontroller Software Interface Standard (CMSIS) for
programming Cortex-M0 microcontrollers. The CMSIS is an integrated part of the device
driver library.
Bits
[31:2]
[1]
[0]
•
•
supports the following data types:
– 32-bit words
– 16-bit halfwords
– 8-bit bytes
manages all data memory accesses as little-endian. Instruction memory and Private
Peripheral Bus (PPB) accesses are always little-endian. See
more information.
25–25.4.7.6.
All information provided in this document is subject to legal disclaimers.
Name
-
Active stack
pointer
-
Rev. 1 — 15 February 2011
for more information.
Section
Function
Reserved
Defines the current stack:
0 = MSP is the current stack pointer
1 = PSP is the current stack pointer.
In Handler mode this bit reads as zero and ignores writes.
Reserved.
Chapter 25: LPC122x Appendix ARM Cortex-M0
25–25.4.7.5.
Section 25–25.5.2
Section 25–25.3.3.6.1
Section 25–25.3.2.1
for more
UM10441
© NXP B.V. 2011. All rights reserved.
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